If a – b = 5 and a + b = 15, find the value of a^2 – b^2.
A50
B75
C100
D125
Explanation
Use difference of squares identity: a^2 – b^2 = (a – b)(a + b) = 5 * 15 = 75.
Exam Relevance
- Topic: Basic Algebra & Equations
- Subtopic: Algebraic Identities
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